All our levels can be completed without purchasing lives, coins or boosters, but if you're still not able to beat a level or are getting frustrated, consider the purchase of a booster. Boosters can give you the extra edge you need to finish a level so that you can get to all the levels we've released recently. There's nothing better than playing new content!
Try and make super paints (4-5 in a row, or combining paints in different ways) to clear hard levels. Combining super paints will also create a new effect that can sometimes clear almost an entire board!
If you're having trouble with obstacles, check out our obstacle help page.